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Chemical and Biological Technologies in Agriculture

Table 3 CHN and crush strength analysis for raw coal and combined coal and urea granules, percentages on dry basis

From: A slow release nitrogen fertiliser produced by simultaneous granulation and superheated steam drying of urea with brown coal

Urea: wet coal ratio

C %

H %

N %

Crush strength (N)

Typical victorian BC

65–67

4.5–5

0.5

ND

UBC-H (lab granulation)

46.5

5.7

17.1

ND

UBC-M (pilot granulation)

45.2

5.6

10.7

2.9 ± 1.0

2.2 ± 0.5

UBC-L (lab granulation)

51.5

5.4

8.7

ND

  1. Note that two crush strengths are given for UBC-M, representing two different batch runs of the pilot-scale granulation
  2. UBC urea-brown coal granule at low N (L), high N (H) or medium N (M) content; ND not determined
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